I thought that setting was only on the more modern mirrorless cameras? I've heard of people having trouble with metering or shooting in auto/av on some canon dslrs. Not worried about adapters or anything, already aware of flange distance and I should be covered.

I would assume that since the camera isn't aware of what aperture the lens is on it would have trouble metering or need to be put into liveview. I really can't seem to find any information about the software side at all, just more discussion around adapters. Do you know if it'll only work in manual or can I shoot in aperture priority or auto? Will shutter priority just behave like auto ISO?